Wireless data and power

1. Wireless data and power Brian McKinney Michael Vincent

2. What we are doing • Ultimate goal is to create a device capable of precisely stimulating tissue in-vivo without connection to outside • Lack of external connection implies IC needs to derive both power and data from RF signal

3. Test Bench • Not a mixed signal IC but needed for simulation and testing purposes • Generates random data • Frames random data (e.g. start/stop and parity bits) • Modulates carrier (ASK) with framed data

4. Regulator • “Buck” type step down switching regulator

5. Ramp Generator

6. Comparator

7. Switch Side

8. Specifications

9. Results

10. Data Path Envelope Detector Input: AM Signal (4MHz) Output: 100 Kbps “Dirty Data” Clock Recovery Input: 100 Kbps “Dirty Data” Output: 100 KHz Synchronous Clock Timing Control Inputs: 100 Kbps “Dirty Data” 100 KHz Clock Outputs: Clean Clock, Clean Data, Frame Strobe

11. Behavioral Simulation

12. Bandpass Filter

13. Delay-Lock Loop

14. PLL Theory

15. Phase Detector Operation clk = 0 data = -(¾) Vout (¼)VDD clk = 0 data = 0 Vout VDD clk = /2 data = 0 Vout (½)VDD

16. VCO • Current Starved VCO • Vout-filterrange: 0 – VDD • fmin = 90 kHz • fmax = 105 kHz • (½)VDD  ftyp = 100 kHz

17. Full Data Path Simulation

18. Conclusions and Q&A